PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-13:13:00
G01     229.9          21.3                6.0 +/-    3.35      12.7 +/-    3.35  0.310 / 0.140
G03     292.6          69.3                6.3 +/-    0.77       6.6 +/-    0.77  0.220 / 0.350
G14     81.5           27.1                7.5 +/-    1.09      14.1 +/-    1.09  0.040 / 0.040
G16     154.7          36.9                8.6 +/-    0.67      13.2 +/-    0.67  0.040 / 0.040
G22     216.1          73.4                8.0 +/-    0.52       8.3 +/-    0.52  0.030 / 0.030
G23     303.1          33.5                4.7 +/-    1.09       7.6 +/-    1.09  0.030 / 0.030
G26     112.6          52.7                9.0 +/-    0.83      11.0 +/-    0.83  0.110 / 0.140
G31     43.3           37.9                6.5 +/-    1.21       9.8 +/-    1.21  0.090 / 0.150
G32     92.9           13.7                8.3 +/-    2.24      21.2 +/-    2.24  0.140 / 0.280